Mishras Bauble is a staple in any Cube supporting cards with delirium and/or Lurrus of the Dream-Den, and it carries its weight well with the odd revolt and threshold card as well
You can load your deck with every Glass Casket, Devout Decree, and Aether Gust at the two, and the Red deck is just never going to get going before you drop a Dream Trawler
This can and has easily gotten out of control, with over 6,000 goblins on the field, all with bonuses from other goblin cards like Goblin Chieftain
From what I can tell, this is often considered the secondary option to PSA, since PSA-graded cards tend to sell for more than SGC cards on average
(2013-06-07) If a token with no -1/-1 counters on it has persist, the ability will trigger when the token is put into the graveyard